Emerald Lilly Fennell (born 1 October 1985) is an English actress, filmmaker, and writer. She has received numerous accolades, including an Academy Award, two BAFTA Awards, and nominations for three Primetime Emmy Awards and three Golden Globe Awards.

Fennell first gained attention for her roles in period films, such as Albert Nobbs (2011),  Anna Karenina (2012), and The Danish Girl (2015). She gained prominence for her starring role in the BBC One drama series Call the Midwife (2013–2017) and for her portrayal of Camilla Parker-Bowles in the Netflix drama series The Crown (2019–2020), the latter of which garnered her a Primetime Emmy Award nomination.